High winds blew through southwest Des Moines Wednesday night, causing massive oak trees to crumble, debris scattering everywhere and leaving neighborhoods without power.WATCH VIDEO HERE. “Like 15 seconds it was just boom. It hit, and then it was done,” said Lorna Johnson, of Des Moines. “The thought of all these wonderful trees gone is sad.”At 3:45 p.m., the sky turned to charcoal.Kristi Berg saw the KCCI weather alert.“I just yelled at the kids, ‘Go to the basement.’ We got downstairs, and the second we got in the basement, it just hit us,” she said.The storm obliterated her front yard, turning it into an unrecognizable mess.“My heart just stopped,” Berg said. “I couldn’t believe how much damage happened in such a short amount of time. It’s unbelievable.”Berg said oaks came crashing down in a matter of seconds.Strong winds shattered the glass on the second floor of Jefferson Elementary, snapping a power pole at its base.Mid-American is surveying the damage.The National Weather Service will be surveying the area Thursday to determine whether the damage was the result of straight line winds or an actual tornado.